Faithful look at a giant screen on St Peter's square showing Pope Benedict XVI boarding a helicopter at the Vatican on February 28, 2013 at the Vatican. (Photo: ALBERTO PIZZOLI,ALBERTO PIZZOLI/AFP/Getty Images)

Benedict XVI’s Final Day As Pope

Pope Benedict XVI walks away for the last time as head of the Catholic Church, from the window of Castel Gandolfo where he will start his retirement today on February 28, 2013 in Rome, Italy. (Photo by Christopher Furlong/Getty Images)

Benedict XVI’s Final Day As Pope

Pilgrims wait for Pope Benedict XVI to wave, for the last time as head of the Catholic Church, from the window of Castel Gandolfo where he will start his retirement today on February 28, 2013 in Castel Gandolfo, Italy. (Photo by Oli Scarff/Getty Images)

Benedict XVI’s Final Day As Pope

Pope Benedict XVI attends a meeting with his cardinals during a farewell ceremony in the Clementine Hall of the Vatican's Apostolic Palace on February 28, 2013 in Vatican City, Vatican. (Photo by L'Osservatore Romano / Vatican Pool via Getty Images)

Benedict XVI’s Final Day As Pope

Pilgrims wait for Pope Benedict XVI to wave, for the last time as head of the Catholic Church, from the window of Castel Gandolfo where he will start his retirement today on February 28, 2013 in Castel Gandolfo, Italy. (Photo by Oli Scarff/Getty Images)

Pope Benedict XVI attends a meeting with his cardinals during a farewell ceremony in the Clementine Hall of the Vatican's Apostolic Palace on February 28, 2013 in Vatican City, Vatican. (Photo by L'Osservatore Romano / Vatican Pool via Getty Images)

Benedict XVI’s Final Day As Pope

A helicopter flies by the dome of St Peter's basilica at the Vatican on February 28, 2013 in Rome. (Photo: GABRIEL BOUYS,GABRIEL BOUYS/AFP/Getty Images)

Benedict XVI’s Final Day As Pope

Assistants prepare the balcony where Pope Benedict XVI will salute faithful upon his arrival on February 28, 2013 in Castel Gandolfo. (Photo: VINCENZO PINTO/AFP/Getty Images)

Benedict XVI’s Final Day As Pope

Pope Benedict XVI attends a meeting with his cardinals during a farewell ceremony in the Clementine Hall of the Vatican's Apostolic Palace on February 28, 2013 in Vatican City, Vatican. (Photo by L'Osservatore Romano / Vatican Pool via Getty Images)

Benedict XVI’s Final Day As Pope

Pope Benedict XVI reacts after making his last address to faithful from a balcony upon arrival in Castel Gandolfo on February 28, 2013. (Photo: VINCENZO PINTO/AFP/Getty Images)

Benedict XVI’s Final Day As Pope

The helicopter with Pope Benedict XVI aboard flies over St Peter's square at the Vatican on February 28, 2013 in Rome. (Photo: ALBERTO PIZZOLI/AFP/Getty Images)